END CAP support structure:
description
Transcript of END CAP support structure:
1David SantoyosLHC AUW 18/11/2012
END CAP support structure:
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- Castellated v2.0 - Castellated v3.0
“7 disks – L.O.I.” Layout
2David SantoyosLHC AUW 18/11/2012
Introduction
Nominal Petal radius (Rsensitive=970 mm) is only achieved when the overlap is reduced to 2.5 mm in the sensitive area
New version of the EC disks and support structure triggered by the need of having a system hermetic to PT >= 1 GeV/c particles, this is only achieved:
by increasing petal overlap
by decreasing petal separation along Z
Castellated v2.0 Castellated v3.0
Castellated v1.0
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Castellated v2.0 vs Castellated v3.0
castellated v2.0sensors separation: 20mm
castellated v3.0sensors separation: 15mm
active sensor overlap: 2.5mm
achieves Rout = 971mm
Two approaches to reduce the distance
between petals...
8m
m t
hic
kn
es
s8m
m th
ickness
connectors on both sides of petal
connectors on one side of petal
could be reduced with the angle...
22º
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Castellated v2.0 vs Castellated v3.0 castellated v2.0 castellated v3.0
brown area seats on support structure
pipe layout remains equal for both concepts
303 mm303 mm
different EoP layout...
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Castellated v2.0 structure
Services trays attached to disks...... some of them removable ...
Disks will have openings to optimize the relation stiffness/mass... (not shown in here)
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Castellated v2.0: rods
nu
mb
er o
f ro
ds
to
be
op
tim
ized
...
CF Rods increased the first mode frequency from 7.06Hz to 23.82Hz (previous concept 5D)
7David SantoyosLHC AUW 18/11/2012
castellated v2.0 & v3.0 service trays
126 mm
20 mm
service tray remains equal for both concepts
services trays (x14)
services trays close to rails (x2)
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Castellated v2.0: max. envelope
Rout (max) = 1003mm
Services trays are attached to disks
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Castellated v2.0 structure
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Castellated v2.0 & v3.0: cooling pipe routing (I)pipe connections remains equal for both concepts
50 - 60mm required!!!
Wiggling the pipe for the EoP reduces the gap between barrel and EC
11David SantoyosLHC AUW 18/11/2012
pipe connections remains equal for both concepts
Castellated v2.0 & v3.0: cooling pipe routing (II)
this services layout was developed for Castellated v1.0... Castellated v2.0 & v3.0 will not have this layout as this would required two petal flavours...
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Castellated v3.0 structure
Services trays attached to outer rings...... some of them removable ...
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Castellated v3.0 structure
CF blades 8mm thickness “skins +
honeycomb”
CF blades attached to inner and outer ring
Blades will have openings to optimize the relation
stiffness/mass... (not shown in here)
14David SantoyosLHC AUW 18/11/2012
Castellated v3.0: rods
nu
mb
er o
f ro
ds
to
be
op
tim
ized
...
CF Rods increased the first mode frequency from 7.06Hz to 23.82Hz (previous concept 5D)
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Rout (max) = 1006mmServices trays are attached to outer rings
Castellated v3.0: max. envelope
... needs to be optimized
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Castellated v3.0 structure
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Conclusions
Two new layouts for EC Castellated version modeled
EC envelope for both new layouts➘ Approximated dimensions➘ Assembly sequence feasible
Service channels modeled (grouped in 16 trays concept at outer radius)➘ Need to be optimized
Next steps...
Electrical cables routing...
Optimization studies for disks, blades, rings, rods... Material Stiffness
Services tray design for optimization... Manifolding, wall thickness, insulation, cable shielding...
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Back-up
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Castellated v1.0...Maximum number of petals should be replaced if needed...
...Reduce the system as much as possible in radius direction...
...Isolate services from sensors (petals)...
....Provide enough stiffness...
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Castellated v1.0 substructure#1Inner shell:
“skins + (honeycomb or low density foam)”Could be also optimized with openings for mass
reduction
“Petals attached to substructure #1 (disks)”
CF disks 8mm thickness “skins + honeycomb”
optimized with openings
“CF Frames to keep disks separated (provide stiffness)”
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Castellated v1.0 substructure #1CF Rods increase the first mode frequency from 7.06Hz to 23.82Hz (previous concept 5D)
CF Rods do not interfere with petal insertion...
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Castellated v1.0 substructure #1
Openings width determined by FEA (mass optimization)
Openings width (previous
concept 5D)
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Castellated v1.0 substructure #2
“CF Rings attached to rails... sustain service
trays”
“Substructure #2 is isolated from
substructure #1”
“Number of CF Rings to be confirmed by FEA”
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Castellated v1.0 Front view services
16 service trays concept; the total number of service-channels are 18 (the
ones over the rails are split in two)
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Castellated v1.0 Front view services
16 service trays concept; the total number of service-channels are 18 (the
ones over the rails are split in two)
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Castellated v1.0 Services trays
Petal layout (both sides)
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Castellated v1.0 cooling pipes Petals cooling pipes should not interfere with insertion of adjacent petals (as much as possible...)
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Castellated v1.0 cabling
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Castellated v1.0 Envelope
R360: Inner Cylinder
R967: Silicon
R975: Petal
R978: Disk
R1025: Out. Ring
R992: GapR996: In. Ring
R1020: Services
R384: SiliconR377: Petal
R370: DiskR368: Gap
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Castellated v1.0 Petal considerations320mm
310mm
EOS dimensions
Upgrade(M. Stanitzki)
Approx. 12mmSensor-to-disk
Sensor position: - No overlap between sensors mounted on petals- 3mm active sensor overlap adjacent petals on same disk- No overlap considered between disks
Number of ears (just one):
Petal width decreases Cabling and cooling -> unique exit
Electrical connections on both
sides (disk-side)
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290 mm
Castellated v1.0 Petal considerations
How much petal width can be reduced?